title: Evidence of macroscopically entangled protons in a mixed isotope crystal of KH(p)D(1-p)CO3.
abstract: We examine whether protons and deuterons in a crystal of KH(0.76)D(0.24)CO(3) at 300 K are particles or matter waves. The neutron scattering function measured over a broad range of reciprocal space reveals the enhanced diffraction pattern anticipated for antisymmetrized macroscopic states for protons (fermions). These features exclude a statistical distribution of protons and deuterons. Raman spectra are consistent with a mixture of KHCO(3) and KDCO(3) sublattices whose isomorphous structures are independent of the isotope content. We propose a theoretical framework for decoherence-free proton and deuteron states.
authors.affiliation: LADIR-CNRS, UMR 7075, Université Pierre et Marie Curie, Thiais, France. fillaux@glvt-cnrs.fr
authors.forename: François
authors.initials: F
authors.lastname: Fillaux
authors.forename: Alain
authors.initials: A
authors.lastname: Cousson
authors.forename: Matthias J
authors.initials: MJ
authors.lastname: Gutmann